Answer:
The oxidation number of sodium in the Na+ ion is +1
Explanation:
oxidation number of chlorine in the Cl- ion is -1. 3. The oxidation number of hydrogen is +1 when it is combined with a nonmetal as in CH4, NH3, H2O, and HCl.
Answer : The balanced chemical reaction will be,

Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.
The coefficient tell us about that how many molecules or atoms present in the chemical equation.
The given chemical reaction is,

This reaction is an unbalanced chemical reaction because in this reaction number of hydrogen bromine atoms are not balanced.
In order to balance the chemical equation, the coefficient '2' put before the
and we get the balanced chemical equation.
The balanced chemical reaction will be,

Chemical, the mixture cannot return to its former state.
The sum of the protons and the neutrons of an atom is equal to the ATOM'S ATOMIC MASS. This mass is concentrated in the nucleus of the atom.
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Answer:
<h3>The answer is 50 kg</h3>
Explanation:
The mass of the skater can be found by using the formula

f is the force
a is the acceleration
From the question we have

We have the final answer as
<h3>50 kg</h3>
Hope this helps you